The quantum solitons atomtronic interference device

TL;DR

This paper investigates a ring-shaped quantum system of attracting bosons with a weak link, revealing how solitonic currents can be used for atomtronic interference, with potential applications in quantum sensing.

Contribution

It introduces a novel atomtronic device based on quantum solitons, analyzing the interplay between interactions and weak link strength, and demonstrates a two-level system of coupled solitonic currents.

Findings

Current is a universal function of impurity strength and interaction.

System exhibits a two-level structure of solitonic currents.

Momentum distribution reveals the current states.

Abstract

We study a quantum many-body system of attracting bosons confined in a ring-shaped potential and interrupted by a weak link. With such architecture, the system defines atomtronic quantum interference devices harnessing quantum solitonic currents. We demonstrate that the system is characterized by the specific interplay between the interaction and the strength of the weak link. In particular, we find that, depending on the operating conditions, the current can be a universal function of the relative size between the strength of the impurity and interaction. The low lying many-body states are studied through a quench dynamical protocol that is the atomtronic counterpart of Rabi interferometry. With this approach, we demonstrate how our system defines a two level system of coupled solitonic currents. The current states are addressed through the analysis of the momentum distribution.